Question

how do you find the Max/Min and saddle points?

Answer 1

differentiate the expression, equate this to 0 and solve,
the roots will give the x coordinate of the max/min or saddle point.
the second derivative will help you find which it is

Answer 2

Post a question. Easier to understand with numbers and stuff.

Answer 3

yeah, a tangent plane is tricker to play with than a tangent line :)

Answer 4

\[f(x,y) = x ^{3} - 12x - y ^{3} + 3y\]

Answer 5

Several steps. First find\[f _{x}\]and\[f _{y}\]